Have to agree totally with Chilli Monster on this one.
There is far too much reliance on the radio these days and not enough on lookout and plain old airmanship. Yes the radio is a useful tool but it is only part of your armoury.
I recall the days when I started flying at a local GA airfield when at the weekend we often had up to 12 a/c airborne in the circuit with others joining. Everyone flew a standard overhead join and we never had any incidents and this was all done NON RADIO!